package com.sky.service.impl;


import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        try {
            ShoppingCart shoppingCart = new ShoppingCart();
            BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
            //只能查询自己的购物车数据
            shoppingCart.setUserId(BaseContext.getCurrentId());

            //判断当前商品是否在购物车中
            List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

            if (shoppingCartList != null && shoppingCartList.size() == 1) {
                //如果已经存在，就更新数量，数量加1
                shoppingCart = shoppingCartList.get(0);
                shoppingCart.setNumber(shoppingCart.getNumber() + 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            } else {
                //如果不存在，插入数据，数量就是1

                //判断当前添加到购物车的是菜品还是套餐
                Long dishId = shoppingCartDTO.getDishId();
                if (dishId != null) {
                    //添加到购物车的是菜品
                    Dish dish = dishMapper.getById(dishId);
                    shoppingCart.setName(dish.getName());
                    shoppingCart.setImage(dish.getImage());
                    shoppingCart.setAmount(dish.getPrice());
                } else {
                    //添加到购物车的是套餐
                    Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                    shoppingCart.setName(setmeal.getName());
                    shoppingCart.setImage(setmeal.getImage());
                    shoppingCart.setAmount(setmeal.getPrice());
                }
                shoppingCart.setNumber(1);
                shoppingCart.setCreateTime(LocalDateTime.now());
                shoppingCartMapper.insert(shoppingCart);
            }
        }catch (Exception e){
            e.printStackTrace();
            System.out.println(e.getMessage());
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart.
                builder().
                userId(BaseContext.getCurrentId()).
                build());
    }

    /**
     * 清空购物车商品
     */
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */

    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }

}

